Clock face



FIG. 1 is a front, top and left side perspective view of a clock face, showing my new design, the rear being flat, plain and unornamented;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a bottom plan view thereof.

The broken-line showings of "hands" are environmental only and form no part of the claimed design. 

The ornamental design for a clock face, as shown and described. 